Apparatus for evaporating or concentrating liquids.



E. SH'AW.

APPARATUS FOR'EVAPORATiNG 0R CONCENTRATING LIQUIDS. APPLICATION FILED MAY 31, I917.

'1 ,29@,793, Patented Apr. 8, 1919.

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' :ixrrnaaamrusiron.'iivirr'ozairrr veon ooneniwrnariitcr titmins To all 'whonritimag comer m- Be .it known that II; EDWARD SHAW, a subject of. theiK ing "of Great Tiiritain, residing have invented certain new and useful Improvements in Apparatus for- Evaporating "or Concentrating Liquids, ofwhich the following Yis specification, reference being "had Ethere'in to the accompanying drawing.

' cific improvement uporrmy This invention relates to an improvement in an apparatus for evaporating 'or concentrating liquids, particularly solutions such for example as sugar syrups, and is *a spe- U. S. Patent lilipnber 1,164,413, dated December 14th,

' The apparatus disclosed in my said patent comprises a spiral passageway gra'du ally increasing in area and formed by a spiral plate interposed between two tubes, the outer of which is steam jacketed and'ithe inner of which serves as an outlet for the steam from the end of thespiral passage. In this patent the inner tube is composed of a cane surroun'ded'by a cy linder, the cone being inverted so that the passage increases in area toward the lower end. The liquid is forced in regulated quantity at the top of this spiral passage and a slight space is left between the outer edge of the spiral plate or shelf and the surrounding cylinder for the passage of some syrup for the purpose of allowing a portion of the liquid to pass the edge of the spiral plate as it is whirled through the spiral passage.

My present improvement is to slope the spiral shelf or plate downward to an angle preferably of about 45, but the angle may vary from 30 to according to the nature of the solution being treated.

This improvement is found to have great practical value in a vertical apparatus, as here shown, because it keeps a better film on the hot surface of the steam heated tube and prevents the syrup from traveling along a relatively cold platform and relatively cold inner tube or cone.

The accompanying drawing 1s a central vertical sectional view of an apparatus embodying my present improvement.

This apparatus embodies an outer Jacket 00 and an inner cylinder 7) which surrounds and incloses a conical tube 0, which tapers downwardly. The upper end of the conical tube c is screwed or'fitterl to a flange d at the upper end of the jacmt a, and the lower n J Specification of LettersI a tent. ='lpplication filedfiay31, 1917. Seria1No.-172,128.-

I Patented 919;

end of the conical tube c the a;

lower end of the cylinder 6; The-'lower-end oflthe jacket (1 is provided with arflange'c which receives the lower .end-ffof the" "cylinder 6. Secured to the lower endiof the steam ij acket a is a conical coverg which is also provided with a steam jacket it into which'the heated liquid flows from the said spiral passage. The lower end'of the cover 9 may be furnished with a valve that is supported by a lever is, which is influenced by a spring 0 arranged between a fiangep on the lower end of a rod'r, pivoted to the outer end of the lever k and a lug son the bracket t, which carries lever is. In practice however,'it is found that the valve may be dispensed with, the steam passing away freely through the cone 0, the valve being used when it is required to clean the appa ratus by pumping water through it. -"The upper port-ion of the rod 1 is screw thread ed and extends through the lug 8, above which is fitted a milled nut w wherebyzthe tension of the spring 0 can be adjusted as desired.

Provision is made for differences in expansion of the parts, for example, by an outwardly the lower end of the cylinder 7), which allows the cylinder to expand and contract without straining the flanged joints of the steam jacket a.

A spiral plate, flange or shelf A is interposed between the cone 0 and the surrounding cylinder 6, and projects close to but out of contact with the surrounding cylinder b to form a spiral space between the spiral flange and the surrounding cylinder, whereby the syrup is spread upon the inner surface of the steam heated cylinder 7). In this improvement the spiral flange a is declined or sloped downward which will prevent the syrup from running in contact with the relatively cold spiral flange and the inner cone 0, which is a great practical improvement over the construction shown in my aforesaid patent, which patented construction permits the syrup to remain and travel on the flange thus having a disadvantageous cooling of the liquid being treated. The steam arising from the treatment of the liquid escapes through the cone 0 and out of the outer end into any suitable pipe (not shown) connected therewith.

In the practice of the apparatus shown in my hereinbefore mentioned patent, 1 have talplatform, with the steam moving along the spiral passage at the top. For this reason myxpatentedapparatus is not adapted toproperlyhandle viscous liquids, or liquids whlch become viscous by concentration. My presentiimprovement overcomes the abovementioned weakness of my said patent, and the-apparatus herein shown and described is adapted to properly and successfully handle the Various kinds of liquids in evaporating or concentrating sugar syrup.

fBy inclining the flange or shelf A, as shown, I find that the liquid in its downward passage is caused to travelagainst the hot wall of the cylinder 6, instead of upon the relatively cold shelf A and against the relatively cold tubular cone 0.

Having thus described my invention, what I claim and desire to secure by Letters Patcut is 1. An apparatus for evaporating or concentrating liquid by forcing it through a spiral passage of gradually increasing area formed by a downwardly inclined spiral flange interposed between two tubes within a steam jacket, whereby the liquid is caused to travel downward against the outer hot tube, and whereinthe inner of said tubes serves as the outlet for the vapor or steam y from the lower end of the spiral passage,

and the outer tube spiral passage so that to flow along the wall set forth.

2. An apparatus for evaporating or concentrating liquid by forcing it through a spiral passage of gradually lncreasing. area formed by a downwardly inclined spiral extends beyond the the syrup continues of the outer tube, as

flange interposed between two tubes within a steam jacket, the spiral flange of a width to 7 In testimony whereof I hereunto affix my signature in the presence of two witnesses,

EDWARD SHAW.

WVitnesses: I

J. H. PARKIN, W. CHARLES CoLAW.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

